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Home >> Nissan-Datsun >> 2012 >> Sentra SE-R >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Component Testing (Qr25DE) >> Refrigerant Pressure Sensor >> Diagnosis Procedure
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Diagnosis Procedure

  1. CHECK REFRIGERANT PRESSURE SENSOR OVERALL FUNCTION
    1. Start engine and warm it up to normal operating temperature.
    2. Turn A/C switch and blower fan switch ON.
    3. Check voltage between ECM terminal 39 and ground with CONSULT or tester.

    Voltage: 1.0 - 4.0 V 

    Fig 1: Checking Refrigerant Pressure Sensor Overall Function
    G04926281Courtesy of NISSAN NORTH AMERICA, INC.

    OK or NG 

    OK: INSPECTION END 

    NG: GO TO 2.

  2. CHECK GROUND CONNECTIONS
    1. Turn A/C switch and blower fan switch OFF.
    2. Stop engine and turn ignition switch OFF.
    3. Loosen and retighten ground screws on the body.

    Refer to "GROUND INSPECTION ".

    Fig 2: Identifying Body Ground (E9 And E15) And Washer Tank With Fuse And Fusible Link Box
    G08185525Courtesy of NISSAN NORTH AMERICA, INC.

    OK or NG 

    OK: GO TO 3.

    NG: Repair or replace ground connections.

  3. CHECK REFRIGERANT PRESSURE SENSOR POWER SUPPLY CIRCUIT
    1. Disconnect refrigerant pressure sensor (1) harness connector.
      • ←: Vehicle front
    2. Turn ignition switch ON.
      Fig 3: Identifying Refrigerant Pressure Sensor
      G04925653Courtesy of NISSAN NORTH AMERICA, INC.
    3. Check voltage between refrigerant pressure sensor terminal 3 and ground with CONSULT or tester.

    Voltage: Approximately 5 V 

    Fig 4: Checking Refrigerant Pressure Sensor Power Supply Circuit
    G04894984Courtesy of NISSAN NORTH AMERICA, INC.

    OK or NG 

    OK: GO TO  5.

    NG: GO TO 4.

  4. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E3, F2
    • Harness for open or short between refrigerant pressure sensor and ECM

    Repair open circuit or short to ground or short to power in harness or connectors.

  5. CHECK REFRIGERANT PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check harness continuity between refrigerant pressure sensor terminal 1 and ECM terminal 40. Refer to Wiring Diagram .

      Continuity should exist  .

    4. Also check harness for short to ground and short to power.

    OK or NG 

    OK: GO TO  7.

    NG: GO TO 6.

  6. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E3, F2
    • Harness for open or short between refrigerant pressure sensor and ECM

    Repair open circuit or short to ground or short to power in harness or connectors.

  7. CHECK REFRIGERANT PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
    1. Check harness continuity between refrigerant pressure sensor terminal 2 and ECM terminal 39. Refer to Wiring Diagram .

      Continuity should exist  .

    2. Also check harness for short to ground and short to power.

    OK or NG 

    OK: GO TO  9.

    NG: GO TO 8.

  8. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E3, F2
    • Harness for open or short between refrigerant pressure sensor and ECM

    Repair open circuit or short to ground or short to power in harness or connectors.

  9. CHECK INTERMITTENT INCIDENT

    Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

    OK or NG 

    OK: Replace refrigerant pressure sensor. Refer to , "REMOVAL AND INSTALLATION FOR REFRIGERANT PRESSURE SENSOR ".

    NG: Repair or replace.

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